The research library.
The state of the field — memory science, assessment, AI tutoring, and the findings that didn’t survive replication. Every article is citation-first and peer-review-anchored; Future Proof™ appears only where the evidence earns it.
Memory & practice
The Forgetting Curve, Replicated
Ebbinghaus’s 1885 curve, its 2015 replication, and the most expensive ignored fact in training.
Read →The Testing Effect
Why quizzing beats re-reading — the highest-yield intervention in the learning literature.
Read →The Spacing Effect at Industrial Scale
Distributed-practice meta-analyses and what optimal gaps mean for a workforce.
Read →Desirable Difficulties
Bjork’s programme: why easy training feels good and fails, and struggle predicts retention.
Read →Interleaving
Mixing related-but-distinct topics feels worse and works better. The evidence.
Read →Calibration: Knowing What You Don’t Know
Confidence-accuracy gaps in adults, and why calibration is trainable.
Read →Assessment science
How 24 Questions Can Map a Mind
Item Response Theory and computerized adaptive testing, from ETS to today.
Read →Bloom’s Taxonomy, Seventy Years On
The 1956 original, the 2001 revision, and why most LMS assessment never leaves recall.
Read →What Actually Predicts Job Performance
A century of selection meta-analysis, including the 2022 re-ranking.
Read →Structured Interviews and BARS
Why anchored scoring beats gut feel in validity and legal defensibility.
Read →The Big Five at Work
What the meta-analyses show — and the honest limits vendors gloss over.
Read →Skills-Based Hiring: Evidence vs. Hype
Degree inflation research and what happens when employers drop the proxy.
Read →AI & tutoring
Bloom’s 2-Sigma Problem, Forty Years Later
The 1984 benchmark and how close intelligent tutoring systems actually got.
Read →LLM Tutors: The First Real RCTs
Harvard, Nigeria, Turkey — where AI tutoring genuinely moves outcomes and where it backfires.
Read →Can AI Write Exam-Quality Questions?
Automatic item generation research, and why human review remains a hard gate.
Read →The Socratic Constraint
Worked examples, guidance fading, and when withholding the answer drives learning.
Read →Early-Warning Systems That Actually Warn Early
From Purdue Course Signals to modern at-risk prediction — achievements and failure modes.
Read →The uncomfortable evidence
Learning Styles Is Dead. Here’s What Survived.
The meshing-hypothesis takedown and the replication reckoning in learning research.
Read →Why Compliance Training Doesn’t Transfer
The completion-vs-behavior gap in the transfer-of-training meta-analyses.
Read →Gamification: What the Meta-Analyses Say
Streaks and leaderboards work under specific conditions — and backfire under others.
Read →The science pillars
Memory Science & Spaced Repetition
Why scheduling review before forgetting lifts long-term retention 30–40%.
Read the deep dive →Adaptive Diagnostic & Item Response Theory
How 24 adaptive questions pinpoint a learner as precisely as a 100-item test.
Read the deep dive →Confusion Pairs & Interleaving
The retention boost from mixing related-but-distinct concepts.
Read the deep dive →All seven pillars
Memory, diagnostics, interleaving, misconception repair, calibration, tutoring, knowledge graphs.
Open the library →Reviewing us for a pilot?
We’re happy to share methodology, raw effect sizes, and references with your research team.